What is the atomic number of the atom shown?

18

Explanation:

Atomic number of an element is defined as the number of protons present in the element.

The mass number of an element is defined as the addition of the number of proton and neutron present in the element.

In the example above, the atom has a proton of 18. This signifies that the atomic number of the element is 18.

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

answer: the answer is b